White bird follows a second (5)
I believe the answer is:
ashen
'white' is the definition.
(I've seen this before)
'bird follows a second' is the wordplay.
'bird' becomes 'hen' (hen is a kind of bird**).
'follows' is a charade indicator (letters next to each other).
'a second' becomes 'as' (I've seen this in other clues).
'hen' put after 'as' is 'ASHEN'.
(Other definitions for ashen that I've seen before include "Livid" , "Drained of colour" , "Pale in complexion" , "Bloodless" , "Very pale, with shock or fear" .)